363-206-305
Maintenance Description
Issue 3 June 2000
9-27
Additionally, each DS1PM circuit pack measures the near-end performance of the
incoming DS1, allowing the service provider to determine if a good DS1 signal
was received from the customer before transporting it through the network. This
information can then aid in sectionalizing any reported performance problems.
The DS1PM circuit pack can also provide this same near-end information for
superframe (SF) formatted (sometimes known as "D4 framing") DS1 services, but
complete end-to-end performance verification is limited due to the lack of the PRM
in the SF format.
See the “Performance Monitoring Parameters Provisionable via the CIT” table for
the DDM-2000 FiberReach Multiplexer in Chapter 10, “Technical Specifications.”
DS3 Performance Monitoring
9
DS3 Path PM
9
With BBG4B DS3 circuit packs, the DDM-2000 FiberReach Multiplexer provides
three DS3 path PM options: P-bit (parity bit), adjusted F&M bit (frame and
multiframe bit), and C-bit. The options are selected using a command that also
sets the PM mode to "on" (default) or "off," which enables or disables the
monitoring and reporting of DS3 path PM data (see Table 9-1).
P-Bit
9
When provisioned for P-bit, the system calculates and provides counts of DS3
CV-P, ES-P, SES-P, and UAS-P incoming from the fiber and DSX. Quarter-hour
and current day registers are provided with provisionable TCAs on a per-shelf
basis. SEFS are also monitored.
Because P-bits can be corrected at nodes provisioned for VMR along a DS3 path,
the DS3 P-bit PM data may not provide a complete report of the end-to-end DS3
path errors.
Adjusted F&M Bit
9
Adjusted F&M bit PM provides an alternative method for determining and
accumulating DS3 path performance data based on an error estimation technique
using errors on the F&M framing bits to approximate the actual error counts in the
DS3 path payload. F&M bits are not corrected at nodes provisioned for VMR along
a DS3 path. When provisioned for adjusted F&M bit, the system calculates and
provides estimated counts of DS3 adjusted F&M bit CVs, ESs, SESs, and UASs
incoming from the fiber and DSX. Quarter-hour and current day registers are
provided with provisionable TCAs on a per-shelf basis. SEFS are also monitored.
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